Carriage-backsetting mechanism for type-writers.



o. Q.. KAVLE. Y CARRAGE' BAGKSETTING MEGHANISM FOR ATYPE WRITERS.

vPatented Api.. 29, 1913.

PPLLQAIIOH FILED 00127, 1909,

2 SHEETS-SHEET l.

0. 0. KAVLB. CARRAGE BACKSBTTING MBGHANISM FOR TYPE WRITERS.

APPLIOATION FILED 00T.7, 1909.

Patented Apr. 29, 1913.

' 2 SHEETS-SHEET 2.

citizen. of the United 'L N Al TED STATES PATENT OFFICE. oscAR c. KAvLE,or slrnncusn, NEW Yorin, Assignee 'ro HARVEY A. Moyne, or

. sYRAcUsE, NEW YORK.

CARRIAGE-BACKSETTIN G MECHA'NISM FOR TYPE-WRITERS.

Specification of Letters Patent.

Patented Apr. 29, 191.3.

Application tiled October 7, 1909. Serial No. 521,522.

To all whom t may con/'cm Be it known that l, OSCAR C. Knvnn, a- Stutes,residing at Syracuse, in the countv of Onondaga and State .of New York,have invented a new and useful Improvement in Carriage-BacksettingMechanisms for l`ype-Vffriters, of

i which the following is a specification.

This invention relates to typewriters and analogous machines providedwith a carlria e which has n step by step movement, am? moreparticularly to improvements in means' for moving or setting thecarriage back one or more steps or letter spaces.

In the back setting 'devices heretofore used of which I am aware, itisnecessary to exercise care in depressing the actuating prevent thecarriage space, that is, a -quick actuation of the key will givethecarriage momentum enough to casuse it to move two or even more than twospaces. VAttempts'have been made to overcome this defect by provid-ingmeans intended to loek'the carriage or esupement wheel so that it cannot be moved more than 'one space by .each depression of the actuatingkey,1but. these devicesare effective .only whenthe key is fullydepressed; and

even with such devices itis possible, by a quick partiel depression ofthe key, to give theV carriage n n impulse which will cause it to movemore than the one space desired.

LThe primary object of this invention is to overcomev these objections4and produce a mechanism for settingvback the carriage a step at La?time, which will'be positive and certain in action and will positivelyprevent the carriage from being set back adistance greater tho-n one ofits forward step movements at each actuation of the back-setting key,Aregardless owhether the-key is actuated carefully or quickly andwithout especialcare. y

Other Iobjects of the invention are to prnduce a. carriage lback-setting mechanism which is of simple, inexpensive and durableconstruction, is easy to overste, and enables the cari-inge to lbequickly set buck one or 'more steps'without danger of producing egreater-movement thereof than 1s intended; and also to improve vcorra e-bock-'setting mechanisms in the respects ereinafter described :mdnsetforth inr the claims.

These results are attained byproviding a bncksctting'mechanism in whichthe manual force exerted 1n depressing lor actuating the back-settingfinger key does not act directly l rear elevation, partly i-n section,of a, typewriting machine provided with n carriage back-settingmechanism embodying the invention, showing the normal position of theparts. Fig. 2, is 'a simil-ar view, showing lthe back-setting lever setin position for operai tion by its spring to set back the carriage. Fig.3 is a lfragmentary vertical section in line 3-3, Fig. 4. Fig. 4 is alongitudinal sectional elevation substantially in line 4.-'4, Fig. 1. Fig. 5 is a. rontelevation, partly in section', ofthe bock-setting leverand associatedV parts.

Like reference characters refer -tolike parts in' the several gures.

A represents themain frameof u typewriting machine, B the peper platen,C the platen carriage, D the pivoted shift frame by which zthe carriageis 'shifted to place the platen in printing relation to different setsof type, E the poweroperated orA spring drum for causing the lateraltravel of the carriage, F and f respectively the toothed wheel ancooperating holding dog of the ca rringe escapement, and G the pinionwhich is connected to the escapement wheel and meshes with a toothedrack g on the carri. re to govern the letter space' movements orf thecarriage. The operation of these-parts is well known. They may be of anysuitable construction, and -will differ" in different makes oftypewriters.

H represents a ,pnwl lever or device which coperates withjsome suitablepart (preferably theescapement Wheel) connected tothe carriage C forsetting it back, that is, 'moving'it in a direction opposite -to itsletter space omovements. This lever is connected to .s finger key or'lever-by vhiohit is moved manually in one direction .to ace it in ,po`sition to engage and turn tie 4escepeinent wheel beckwardly, and it is.moved yin the fragmentary ment wheel F. The pawl has a tail. that ,i's-

normally held by 'a spring itz-against a stop ha on the lever, wherebythe pawl is adapted tof yield in one direction only. As' the 'escapementwheel is mounted o n the shift` frame it swings slightly when the platenis shifted. The face of the pawl is therefore,

made 'wide enough to engage the wheel -in 'either of its' positions. Theother end .of

. .it isfv etacha ly connecteduto'thekey lever.

the pawl lever is provided with ayhole'z' in wluch engages the rear endof an intermediate lever I-;which extends forwardly A bene'ath 'andisucentrally pivoted 'to the top platea and is connected at its frontend b'y' -a link 1I.to.,anl operatin orkeyleven K.

f The linktv i preferably: as a -pin zand Thiskey lever, which "may be.connected .and mounted similarlygto the key-levers (not shown) :foroperating the -type-bars,is preferably the maehme and provided at itsfront end with 'a finger key l', which is located in the upper'iorrearbank of-'keys in the keybard,

. L'r'epresents .a leaf springnwhicll's secured-by a s'crew l, orotherwise, to the unf' derside ofthe top plate and bears-at its freeenda ainst a. lug-l on the' pawl lever .H;' 40' and represents acoilspringwhich'is attachedjla't" one endoto the linkl i and' at itsotheriend to a. screw mlwhich is screwed into anut m s'eagted in .acountersunk' hole inthe top plat'e,and can be adjustedto' regulate Vthetensioniof the, spring. Mxlby turning' the nut m;

Wh n 1t 1s desired to set back the carriage" thelnger key l7a -isdepressed, which acts through the described connectionseto move the pawl4lever H ffrom the normalposition shown 'in Fig. 1 to theposition'shownin FigxQ.V During this movement olf lever the"escapement wheel -is'heldstationarybyfits dog f, and the pawl It yieldsv and rides over-two teethof the escapementwheel and assumes the 4position shown' in Fig.v2,

infront of thesecond tooth, read-y to engage this tooth andf turn thewheel backwardly during the return movement ofthe lever. The springs Land' M are strained by the depression of the. linger key,V and vwhen thevlinger key is released these springs raise the finger key and returnthepawl lever to their normal positions, and as the 55 pawl is then heldrigid with -the lever by the located at the left-hand side 'of stop h5,it engages the tooth of the escapement wheel in rar of it and turns thewheel backwardly, z'. e., to the left in Figs. 1 and 2, a distancenearly equal to two tooth the' tooth, leaving the wheel free to moveforwardly under the influence of the carriage driving spring, a distanceless than one tooth space, or'until -arrested by the holding dog f. Thelower end of the pawl lever vis adapted to strike the topplate a tolimit its movement by the key lever, and its return is limited oy a lugthereon engaging the hub of the" spring drum E. After the parts havereturned to their normal positions the escapement wheel will have been'forced 'back and will be held one tooth spacefrom where it was beforethe'key lever was depressed. The Wheel is thus moved backwardly morethanv'one 'tooth space in order'to give the holding dog; f anopportunity to move into holding relation to the tooth' next to the onepreviously engaged by it. jWhen'used jyvith amescapement of diiferentconstruction .the p awlmay .son of. the 'construction lof. the.esoapement,

to 'setthe wheel back one. tooth space.

` It willbe'underst'ood from the above that 'the carria and Mg'an thatit: does not begin lts movenent until the key lever is released and per-`mitted to start back 'to its normal-position.

.The-carriage is-,set back'by the power of the springs andnotbythemanual vforce the springs, andstrains. the springs, or `causesthern. to operate. Theosprin act alike 'an `Vall cases, and! it makes.no iierence whether thekey bedeprssed quickly or ;slowly,ior`v whetheror notit. be released v'springs will .act quickly if permitted to doso,and they will act slowlyif the `operator dwellson the key', but inany `case they spaces, when it'passes out of contact'with be made tomove' the wheel either a 'greaten or' a less distance as may be.requiredby. rea- Y set back by the .springs L. x

'applied to 'the Akey 4Aleverby'the operator which sets or places. .thepawl in osition 'for operation on the escapementfw eel by." l

Aproper .action of'the mechanism is Vthat the ey lever be depressed to.itelimitw The lwill setthe carriage 'back one, and only y ,on'e, letterspace for each de ression of the :key lever. The'action lcan repeated asVfast' as desired'ifit'be vdesired to settghef `carriage back'more thanone letter s ace. TheV separate adjustable spring l\ isused to returnthe key.lever, as' it is useful in lsecuring the proper vaction of theback set- .ting pawl when Iirst'-v adjusting the parts, and at anyfuture time when it may be necessary to reinforce the pawl-operatinEither the, spring L vor the spring M could -beused -alone and madeadJustable if de sired, but it ispreferable to use the' two springLlshould the latter become weakene o distance equal to one of'its'springsand make the lighter-one, M, ad` just'abl'e. 'One or more springsor a diie'rent sort of a motor or'p'owersdevicewhich o Perates asdescribed-to Vset backthe carriage afterthekey lever'has been actuated,and which operates on the carriage through the escapementwheel or.otherelement, can

be used, 'and the invention is therefore not restricted to thedescribed. construction of the back-setting mechanism.

I claim as my invention 1. The combination with a paper carriageliavinga' ,motor dri ven step-by-step forward movement, of mechanism forsetting back. the carriage including a power device by the power ofwhich the carriage is set back aforward step movements each time saidmechanism is operated,f and a manually operable device for causing theoperation 'of said power device, substantially as set forth.

2; The combination with aV paper carriage having a motor driven step-b-step forward movement, 'of mechanism for setting back the carriageincludinga spring actuated d evice by the power of which the carriage isset back a distance equalto one .of-its forward step movements each timesaid devicev is actuated, and -means operable at will \to cause theactuating of'said spring'actated device', substantially as set forth,

l 3 The combination with a. paper carriage Y having 'a motor-drivenstep-by-step forward movement, of mechanism for settingback the carriagecomprising a spring for moving the carriage, and. a key. forstrainingsaid spring, substantially as 'set fortlnf 4., The combination with apapercarriage having a st ep-by-step forward movement,

"'iirst engagea tooth of sa1d Wheel .and par- 105' ofmechanism forsetting backthe carriage.

comprising a4 device for moving thecan,A

riage, aspring for operating said device t6V move thecarriagebackwardly, and a key tor placing said device in position for perationand .straining said spring, substantially as set forth.v

5. The'comhination with a paper carriage, and mechanism for mbving thecarriage for` wardly step by step, of mechanism for set-V ting bachthe'carriage a step at a time, in-v cluding. a spring by the power of whichthe carri-age is set back, and means operable at will for straining saidspring whenever its action is desired, substantially as setforth.

6. In a typewriting machine, the 'combination with a carriage having astep-by-stcp forward movement, of a spring and mecha.

nism actuated thereby for' setting back the carriage, a back-settingfinger key4 located at the keyboard, and connections for strain-f ingsaid springwhcnsaidkey Ais actuated, said spring and mech anism'acting-'to set backthe carriage one step for each actuation ofsaidback-setting key, substantially as set forth.

` mechanism for 7. The combination witha paper carriage having Vastepby=step forward movement, of a'spring, a key for straining saidspring, and means which are actuated b said spring. to set back thecarriage upon t e' release of 70 said key, vsubstantially as setfrth;

8. The combination with a' paper carriage having a step-by-'step forwardmovement, of i setting back the carriage comprising a spring for movingthe carriage, anl adjustable auxiliary spring whichassists said firstspring, and means for straining both of said springs, substantially asset forth.

and mechanism for moving the carriage for# wardly step Vby stepincluding a toothed wheel, of mechanism fortu'rning said toothed wheelbackwardly to set-'backtle carriage, comprisinga awl lever, a pawlmounted 8g on saidlever -o swing in substantially the plane of thetobthed wheel and ,toyield and ride over the teethof said wheel "when,the pawl lever is manually moved in one direction and to engage and turnthe toothed wheel ,when vthe pawl leveris released and is permitted.tomove in the opposite direction, and `power means for swinging said pawllever in said opposite direction, sub# stantially-as set-- forth. .1.95110. The 'combinationfwith a papercarriage, and mechanism'formoving thecarriage forwardly `step by step including.; al toothed 1wlieel,jofmechanism for turnin' and adapted when'mbved in onedirectionto tiallyrotate said wheel and then clear said tooth, means for oscillating saidpawl levelfV and means for limiting themovements 'di said pawl lever,substantially'as set forth.'-

11. Tl1e.coinbination `within' paper e'arno riagehaving a st ep-by-stepforward movement, of mechanism for setting back. the carriage comprisinga toothed'wheel, a'pawl 'normally disengaged. from said toothedwheel,inanually-operable means for `posi- .-tioning said pawlto engagesaid toothed wheel, and a spring wli'ch is strained by saidmanually-operable means and acts to' move said pawl and tnrn'saidtoothed wheel a vstep -eachgtinie said mannally.- operable 120 means areactuated,` substantially as seL- forth.

12. Thecombinati0n with a p'apr cars riage, printing mechanism, andpower# drivenmeans controlled by the printing ,mechanism for producingwistep by step forward movement of the carriage, of mech` anism` forsetting back the carriage including a power-'actuated device the powerof.which the carriage isset back, and a la 9. The-combination with apaper carriage, 80

" special finger lrey which acts when moved manually to store power insaid poweractu ated. device and when released to permit the stored powerto actuate said device, subst.mtiallfy 'as set forth.

13. The combination withV a paper carridge, printing mechanism, andpowerdriven means 'controlled .bythe printing A Q .controlled means forsetting. back t e carmechanism for producing a step by'step forwardmovement of the carriage, of mecha.- nism for setting back'the carriageincluding 1 a back-setting key, and a sring which is 1909 i o said keyund Y, acts to set back the carriage when said key 15 strained by theactuation is released, substantially as set forth. p

-14. The combination lwith a paper carringe, printing ,mechanism,- andpower drivenmea'ns controlled by 'the printing mechanism for producing astep by step forward movement of the carriage, 'of mecha Ilism -forsetting back the carriage'including a back-settmg key, a spring which isstrained by 'the actuation of said key', and

-means actuated by said spring when said key is 'released und voperatingthrou l1- said ria e, substantially as set forth.

l itness my hand, this 2nd day of October.

osoARc. KAVLE.

Witnesses:

.CHESTER U. REID, -O'rro A7- SCHILLY.

